This annotation seems to be ignored by hibernate search because lucene no longer supports that feature (see javadoc https://raw.githubusercontent.com/hibernate/hibernate-search/master/engine/src/main/java/org/hibernate/search/annotations/CacheFromIndex.java).

Should be removed from the user guide (http://docbuilder.usersys.redhat.com/23162/#Caching_Index_Values_FieldCache1).